In before the hate train starts rolling full steam ahead right over Microsoft. This is a fantastic decision, they obviously really had no choice otherwise a lot of people would have abandoned Windows 8 development and Microsoft would have looked bad launching an OS that didn't have many supported applications.
As for Windows XP support, why would Microsoft add in support for an OS they don't really support any more? It has been 11 years, well almost 12 since XP came out and the fact people want to support the outdated OS is like asking Google to start supporting Internet Explorer 6 again.