Well I installed yesterday Poser 7 at Lion, there was no issue - I was also very curious, but for me (!) it looks like that P7 works fine.

Of course until now I have just done some small test-renders, but all I tryed worked.
Maybee that the issues relate to things I don't use, I don't know - for me P7 is just for setting up materials. 

With P8 I had also the small issue regarding first install and now the missing icons.

I think also many problems will occur because of the change in the permissions, we will see what else is now "running wild" :P

To be sure I've a backup of my SnowLeo-System, so I can switch back - I set up a virtualized OSX (10.6) if I need to run a programm which is still PPC-Code. 
So there was no risk for me, all others should think if they want to be early adoptors.

(Jesses... I need some sleep, my english is really getting bad...) 

Markus