A number of Sonic 2 in 1 games are set to be released. These are Sonic Advance + Pinball Party, Pinball Party + Collumns (some random tetris game) and Sonic Advance + Sonic Battle.
In the US they’re set to be released on the 15th of November. No word on the UK, but considering how Oz and UK release dates are similar, they’re probably going to be released around November 20th.
Scource: www.gamehead.com.au