In the beginning there was 3, which became 6, 8, and 10. And 10 begat 12. So shall 12 give way to 14.
What the heck am I talking about? Megapixel creep. Yes, folks, it's once again time for the marketing folk to get out their erasers and remove all the references to 12 and start penciling in the new champ, 14. At the upcoming PMA you'll see both compacts and DSLRs start trumpeting the new number as if it were magical.
And buyers will fall for it. You'll hear chants of "More pixels mean better cropping choices." "Advances in noise reduction mean I get the same quality with more quantity." "Finally, I can print 13x19" at 300dpi" (not really, but someone will say something like that). Just remember: more pixels come with other issues, more storage space needed being a big one (and transfer times per image go up).
Here's a better choice for your money: spend it learning how to best use what you've got. Go to PhotoshopWorld and learn some new techniques. Browse Shaw Guides and find a workshop near you. Purchase a good book and study it carefully.
Buying incremental increases like 10 to 12mp or 12 to 14mp generally don't buy you much (though every now and then the camera body the new sensor is in provides something worth the money). A couple of hundred new pixels in each direction almost always gets you less than learning how to properly frame the pixels you have.