I think that all support for XP, Vista and 7 will all end in 2014.
No, it won't. 
http://support.microsoft.com/gp/lifeselectwin
From your link
Windows Vista Home Premium in the U.S.A
1. Service Pack Support has already ended
2. Mainstream support will end on 4/10/12
I would imagine that MSFT will offer extended support for Vista when mainstream support ends just like they are doing for XP.
Windows XP Home Edition in the U.S.A
1. Mainstream support is done.
2. Extended support end date is 4/8/14.
Extended support includes
1. Paid support
2. Security update support
3. Non-security hotfix support but only if you purchased an extended hotfix agreement, purchased within 90 days of mainstream support ending.
Bottom line is that unless you purchased Windows XP or Windows Vista from a third party you will not be getting any software compatibility updates.
I doubt that there are too many software companies writing new versions of their software with an emphasis on Windows XP or Windows Vista compatibility.