Check out this excellent forum post by Tobias Hathorn, in which he describes the best workflow for Sketchup to Revit conversion via FormIt 360. Interestingly, the major steps are:

  1. Install Revit addin
  2. Use addin to convert SKP to format for Formit
  3. Import to FormIt Web
  4. Export Locally
  5. Use the same Revit addin to convert the FormIt 360 Sketch to RVT

Some more detail here, reproduced from the post:

The one ‘gotcha’ (which should be kind of obvious)… if the model is poorly constructed geometrically in SketchUp, then that same geometry will come down the pipe into FormIt and eventually into Revit… 

Another comment about size – you’ll get better results componentizing your SketchUp import – doing a blanket conversion of your entire existing SketchUp model will take longer and be a MUCH bigger memory footprint.

Here are the steps for SketchUp conversion…

  • Go to the SketchUp Warehouse – browse to a great looking catalog – LINK
  • Download the files you want locally onto the hard drive
  • Get the free FormIt Converter Plugin for Revit 2015 – LINK
  • Install the Plugin and restart Revit 2015
  • Go to the Add-Ins tab, FormIt 360 Conversion panel and choose Convert SketchUp Files from the drop down menu
  • Navigate to the folder with the SKP files in them
  • Then navigate to where I want the FormIt 360 files to be (can also go to A360

Here are the steps for FormIt categorization…

  • Start FormIt Web – LINK
  • Import (or Link through the Content Library) the converted SKP’s – place the content in your FormIt scene…
  • Double click to edit the furniture group – you can push and pull the geometry as if you were in SketchUp!
  • While in Edit Group mode – set the name and category (Furniture) in the properties panel. Finish editing the group.
  • Save the FormIt file and download it locally (to your downloads folder) by clicking ‘Export Locally as FormIt 360 Sketch’

Here are the steps for FormIt to Revit conversion…

  • Open Revit 2015 – Click New file – choose the template you’d like to use for the design model
  • Go to the Add-ins tab and choose “Convert FormIt 360 Sketch to RVT
  • Navigate to the downloads folder and choose the FormIt sketch you exported locally
  • Click through any warnings and now you have Revit versions of SketchUp files!
  • The FormIt elements have the same categorization you set in FormIt
  • and you can double click to edit the families as you would normal Revit geometry

Thanks Tobias!

Original post:
http://forums.autodesk.com/t5/formit-360-general-discussion/sketchup-conversion/m-p/5670578#M235

Starting today, each new FormIt file you create (or old one you edit) will be converted to a RVT file – in addition to the SAT file you currently get. Of course, this all requires that you use your free Autodesk 360 account.
Each RVT file contains the following

  • an in-place mass with a form element for each object that can be edited using the Revit/Vasari conceptual massing tools. That is, it has a clear extrusion between two profiles. All other objects (boolean cuts and joins and objects with edges modified in two or more axes) will come in as non-editable imports. 
  • The latitude and longitude of the location – if you set one in FormIt.
  • Sorry, no images yet.

via
Get your Revit files! | Autodesk� FormIt

EDIT: My post was up before the app I think!  Here is some more info:
Itunes App Store link:
https://itunes.apple.com/us/app/autodesk-formit/id575282599?ls=1&mt=8

Autodesk page:
http://autodeskformit.com/

Autodesk RSS feed for Formit:
http://autodeskformit.com/feed/
And some more from Autodesk FormIt & Revit – The Revit Clinic:

Express design ideas with easy-to-use tools:

  • Create forms quickly from a gallery of shapes
  • Directly manipulate forms using gestures for easy model changes
  • Save designs to the cloud and share with others

Easy access to site information:

  • Set project location in a searchable maps interface
  • Import satellite image of your site
  • Design directly in the context of your proposed building location

Make early design decisions:

  • Explore the effects of the sun using the location-aware Shadow Study tool
  • Start early program analysis by tracking gross building floor area ratio while you design

Experience a more continuous BIM workflow:

  • Store and share designs in the cloud using Autodesk® 360 cloud services
  • Easily transfer designs to desktop applications via RVT or SAT file formats
  • Explore design ideas and add detail to early design forms using award-winning BIM technology


 

FormIt is an intuitive, easy to use mass modeling application helping designers make informed decisions while accessing site and climate data. The building and site aware app allows designers to sketch proposed design options that can be compared with program requirements and then shared with the project team for continued collaboration through Autodesk® 360.

Available now on the Apple App Store.

(I can’t find it on there, can you?)