Sharepoint 2010: 64-bit only

It's been made official. The Sharepoint Team announced that Sharepoint 2010 will be 64bit only. And this means:
1) The product itself will be 64bit only
2) Will only run on 64-bit Windows Server 2008
3) Will only run with 64-bit SQL Server 2008 or 64-bit SQL Server 2005

Why? Due to performance and scalability reasons, Microsoft says. Well, I don't know. I simply can't buy the reasons...