SEGA planning something special for the 20th anniversary of Sonic and Puyo Puyo series by announcing they will release a "variety of projects" involving both franchises for 2011.
Not announced is if there will be a collection disc similar to Mario's 25th Anniversary or other special celebrations Japan received for Mario (ex. Red Wii, Special Mario edition DS, Club Nintendo gifts).
Of the two series, Sonic won't officially celebrate its 20th anniversary until June 23.
http://gamrfeed.vgchartz.com/story/8...sary-projects/
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In unrelated news, Angry Birds coming to PSN store this week. The game won't be remade into "HD" since it is just a straight port from the PC/iPhone version with different controls.