Well I had Studio 12 ultimate That gave me the plugins for (BorisFX,Magic Bullet,ProDad)
When I upgraded to Studio 14 ultimate It gave me the Red Giant Plugins for light or lens flare effect, which is cool & Toonit which turns your video into moving cartoons, which is also cool. The only plugin transfered over from 12 was ProDaD? (I don't know why BorisFX or Magic Bullet was not)
Studio 14 does give you a better Image Stabilizer and a slightly diffrent facelift to the application, however not a real big deal, does look more professional though.
It also allows you to have another montage over a "already active montage" this gives you a limited layer effect, which is also cool. (to bad it is only for montages)
They should of added another audio & video track or made it unlimited
They also added a feature for the titles called (motion titles) which is cool, but would be better if they gave you more control over it.
Studio 14 Ultimate Collection might give you more.
to be honest with you I am disapointed in the upgrade. Should of went with a Sony Vegas 9 Pro or upgraded my version of 12 to Avid Liquid 7
if Studio 12 crashed alot, 14 will be the same...but thankfully they auto save your work.