I’ve stressed to people when I spoke about Dynamic Memory that the Hyper-V folks in Redmond were seriously listening to feedback. The RC release of Service Pack 1 for Windows Server 2008 R2 illustrates this. There are lots of changes to Dynamic Memory. Some affect function and some are cosmetic. Gaurav Anand has all the details in an excellent post.
Download the RC, test it, and send your feedback to MS. It really does count!