Rationale of gcc 4.6.3 on most arch

[Markus Raab <usenet@markus-raab.org>]

Hi Group!

I would like to ask why most arch have 4:4.6.3-8 instead of 4:4.7.2-1[0].
Is it because:
- Some (many) packages do not compile?
- Some (many) packages produce crashes?
- There was simply not enough time? If this is the reason: Is there any 
chance it will be updated before release?

I could not find any information about it.
Afaik up to now all architectures always had the same default compiler, or 
am I missing something?

best regards
Markus

[0] http://packages.debian.org/de/wheezy/gcc