nah, i can somewhat understand the reasons why SP2 would not be supported by RIM, but only to an extent. but their official statement saying there were no known limitations, despite publishing an article not even a month ago stating that there was an issue, a major one at that (imo), is a tad bit misleading.
Now, back to the support in question, I have noticed that RIM is a bit late to support products that have been released in beta, especially freely available to developers for sometime now. This happened with Outlook 2003 and now with Exchange 2003 SP2. a lot of companies who develop products that integrate with various messaging services (or other applications) tend to take part in the beta processes and/or pre-beta processes. This can be seen with hardware manufacturers developing drivers for their video cards or sound cards for Vista. I'm curious if RIM has even installed BES on Vista or is making plans to update their product to support Vista prior to street date. The beta periods and developer betas are there for a reason - so when a fairly popular product hits the streets, they won't be caught blind-sided by those products when their customers are obtaining said upgrades.