Shall I Buy C# 4.0 Books Or Wait For 5.0?

Question

Hello!

I am a completely new to programming, and I would like to learn C#. My college gave me really poor materials and I'm looking forward to buy some good books ("Head First C#" and "C# in a Nutshell"). However AFAIK in April MS is going to release new Framework 4.5, C# 5.0 and Visual Studio 2012. Because of that I am totally confused to buy or not books for ~50 £. Driven by frugality I am warmly asking you for advice - shall I wait till new versions will be released OR jumping from 4.0 to 5.0 will be like a one weekend reading changelog with no reason to buy new books.

Thanks in advance!

*Sorry for terrible English