Instead of just offering one game per classic, MS have included two games for the price of one to give you what they think is better value, which I suppose it is compared to the old classics price, but as usual, you can still get them cheaper separately.
One pack consists of Halo 3 and Fable II, kind of a mismatch when you consider the next pack that has Crackdown and Mass Effect. Now you’re asking, “Why don’t they put Fable II with Mass Effect?” Don’t be silly, then you wouldn’t need to buy the other pack. D’oh!
There doesn’t appear to be any info of when they’re available, but they should retail for £19.99 each or usually around £17.99 or less online.