I just got off the phone with RIM business sales and was told:
(as close to verbatim as possible)
1. Blackberry Enterprise Server has been upgraded to v5.0
2. Blackberry Professional Express has NOT been upgraded to v5.0 -- v4.1 is the available version of Blackberry Professional Express -- and there are currently NO plans for v5.0 of Express being available any time soon
(end of comments from RIM business sales)
So -- it looks like if we want the 1 user freebie, we have to stick to v4.1 for the time being. Perhaps RIM will release Express v5 after Enterprise v5 has had a chance to sell in the marketplace for a bit...or perhaps we're stuck at v4.1
Sad...