EDIT2 – These links should all be ok now.

Note – copy and paste these links, they are not clickable

These are working:
RAC 2014
http://trial.autodesk.com/SWDLDNET3/2014/REVIT/DLM/Autodesk_Revit_Architecture_2014_English_Win_32-64bit_dlm.sfx.exe
RST 2014
http://trial.autodesk.com/SWDLDNET3/2014/REVITST/DLM/Autodesk_Revit_Structure_2014_English_Win_32-64bit_dlm.sfx.exe
RMEP 2014
http://trial.autodesk.com/SWDLDNET3/2014/RVTMPB/DLM/Autodesk_Revit_MEP_2014_English_Win_32-64bit_dlm.sfx.exe
Revit LT 2014
http://trial.autodesk.com/SWDLDNET3/2014/RVTLT/DLM/Autodesk_Revit_LT_2014_English_Win_32-64bit_dlm.sfx.exe

To download, you could use admintool download as per this link, or just use any download manager.

Revit 2014 download link should be:
http://trial2.autodesk.com/SWDLDNET3/2014/RVT/DLM/Autodesk_Revit_2014_English_Win_32-64bit_dlm.sfx.exe
working now! (not yet live, not working 3.30pm 1 April 2013)

Here is the vanilla AutoCAD 2014 link:
http://trial2.autodesk.com/SWDLDNET3/2014/ACD/DLM/AutoCAD_2014_English_Win_64bit_dlm.sfx.exe

Some things are missing (not live yet), and I guess they will become available soon, like:
http://trial.autodesk.com/SWDLDNET3/2014/BDSPRM/DLM/Autodesk_Building_Design_Suite_Premium_2014_English_Win_32-64bit.sfx.exe

Some notes and other links:
http://trial2.autodesk.com/SWDLDNET3/2014/ACD/WI/{64CFA19F-6192-4CD5-AA9E-77334D584BE2}/SETUP_x86.tar.lzma2
(I don’t know what this is for, it was started during the auto download and install process)

Direct link to the download manager:
https://emsfs.autodesk.com/utility/dlm/prod/Installer/2_000_006/AutodeskDownloadManagerSetup.exe

This will install or upgrade Akamai Netsession.  If you want to learn more about Akamai and Autodesk products, check out this link.

The key folder for Akamai is still C:UsersUSERNAMEAppDataLocalAkamai

C:Program FilesCommon FilesAutodesk SharedAutodesk Download ManagerDLMSession.exe

Link to the downloader / installer:
http://trial2.autodesk.com/SWDLDNET3/2014/ACD/WI/AutoCAD_2014_English_Win_32_64bit_wi_en-us_Setup.exe 

A few things happen when the downloader / install launches, like:
/url “http://trial2.autodesk.com/SWDLDNET3/2014/ACD/WI/AutoCAD_2014_English_Win_32_64bit_wi_en-us_Setup.exe” /akamai /auth authparam /sid SESSION_ID

and
2013/4/1:14:50:48    LJ    LJ-NOTEBOOK    Download    Play    SETUP_CONFIG    http://trial2.autodesk.com/SWDLDNET3/2014/ACD/WI/{64CFA19F-6192-4CD5-AA9E-77334D584BE2}/SETUP_x86.tar.lzma2