Improvements in battery technology would make a big difference to virtually all Apple's customers. Greater capacity would be nice but reduced charge times would perhaps make an even greater difference.
To centre of heart. I believe the logo will be smaller and to the left (of the wearer). It looks fine to me but I hope its not sliding towards 'corporate'. The standard position for a company logo or 'badge' is to the left, and smaller.
It doesn't look like enabling TRIM would give me much value and given the potential issues you mention (in addition to the ones listed in the wiki-page Solips pointed me to), I don't think I'll bother :)
Thanks - didn't realize it was a piece of software :). As my primary Mac is a rather aged mb running two third party SSD's in a fusion setup, I am not sure I can, should, or would be advised installing Trim Enabler. In fact, should I even run this update? (I will no doubt back up using ccc and have go, unless you or anybody else here tell me not to)