Here are some of my early observations (rants)

1. DocApps had been replaced by DAR (Documentum ARchive). Old DocAPPs created by Application Builder can be migrated to DAR by using Composer

2. TaskSpace 6.5 + Composer 6.5 = Broken
I cannot, for the life of me, figure out how to import a new  Taskspace applications from repository into Composer 6.5 without it yelling at me about some dm_ type issues.  It seems to be a bug that slipped through QA

3. Even more virtualization lameness for index server
In addition to VMWare ESX guests, now AIX LPARs had also been added to the list of forbidden platform for the FAST index server.
Hello ?! I thought EMC *OWNS* VMWare now ?! Not allowing LPARs will upset a lot of IBM shops (Especially those unfortunate ones using GPFS)

4. 64bit-ness is arriving, at last!
Some of the WDK based applications now says they also support running in 64bit native mode. It is a late, but welcomed change. (However, the thing that really mattered – Content Server, is still 32bit only)

5. JBOSS
To my surprise, JBOSS had replaced (Oracle) Bea Weblogic as the embedded J2EE App server. In my first few lab installs, JBOSS seems to reduce the memory usage somewhat. It may be possible to create a usable Documentum installation including Content Server, Index Server, and Webtop/DA on a laptop like the pre 6.0 days using Tomcat.  (I have yet to try laptop install myself, but judging from the fact that my 6.5 content server install doesn’t even use SWAP while the same VM was swapping with no load under 6.0)