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I do not think this really belong to "ROM hacking", but not knowing where to post it in, I will post it here.
Retrun-Sonic is a packer/unpacker for games made with The Taxman's Retro-Engine SDK (RSDK), which means, yes, that you can now
unpack the datafile of the new Sonic CD remake, modify the contents and then make a  new datafile with the new contents, thereby modifying the game data.
Happy hacking!

http://unhaut.fav.cc/retrun

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NEW (2013 - 05 - 18): release 1.1

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New release 1.1
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There is partial support for the datafile format of the new Sonic the Hedgehog remake for iOS and Android.
More information at http://unhaut.fav.cc/retrun

By the way now it means you can listen to the soundtrack on any device you like!