I can think of only one single reason to upgrade to PD13 - support for alpha channels. And this is only if you are doing special effects work and have the need for such a feature (the vast majority don't). If not, then PD13 has no other additions/features that would be a good enough reason to upgrade. This software is created for "video dads" who do not need any real creative/prodiction power. It's an elementary level product that tries to be a one-stop-shop to get your video from your camera onto a disc. It does a reasonably good job, but with no frills or stability.
I can say this: if the next version of PD doesn't support motion tracking (especially since most every other competingproduct has for multiple versions now, such as Corel VSX, Adobe Premiere Elements, etc), I'm jumping ship and just going full Adobe and doing it right. For me personally, this crash-ware has been nothing but a painful reminder that you get what you pay for.