I was wondering if there was a point in upgrading your gear before Cata.
Will people who have good raid gear be able to use it 80-85 or is 80+ gear really improved?
My guess is that by the time we ding 84, there will be very little difference in the gear of an old raider and that of a toon who dinged 80 the day before Cata released.
The well-geared 80 will likely have a faster go of it for the first 3 levels. But my guess is that the benefit will not be commensurate with the amount of effort it took to get the pre-Cata gear. Said another way: If you try to grind better gear now, the payback you will get will be something on the order of: three minutes saved in Cata leveling, for every hour you spend gearing in WotLK.
However, if you haven't already, I would suggest you work up to doing heroic 5-mans, just to experience the content and hone your skills. 2 weeks is enough time to gear up enough to be allowed into the easier heroics; and you'll want to be able to say you did it. And, yes, the better gear won't HURT.
So, do anything you want: You can gear now, if you want, and lose nothing. Or you can farm rep, farm gold, farm mats for sale in Cata, level an alt, level a profession, or just goof around. I don't think you can do anything pre-Cata which will affect your 80-85 leveling time by more than 5 hours.
If you are wondering about Gold, though, there are many things you could be doing which will definitely affect how much gold you can make in the first few weeks of Cata.
Personally, I am using this time to level alts, level professions and gather stuff that will sell well in Cata. I haven't been into a raid/dungeon on my main since 4.0.1 dropped, and have only been into enough heroics on this toon (Oxx) to barely re-learn the rudiments of tanking with the 4.0.x skill set.
I hope this helps.