I'm hearing from my contacts that this is not the case. In fact, updates to the Windows Mail, Calendar, Music, and Games apps for Windows 8 and Windows RT may be available to users as soon as March (as in this month).
It would seem that before the Blue update Microsft intends to update the core apps that were supplied with the os on shipping. Mary Jo Foley has more:
Microsoft to update its core Windows 8 apps well before 'Blue' | ZDNet