I currently am a 15 year old who has taken on photography as a hobby. As of now, I own the following: T2i, 24-105 F/4L, 40mm F2.8 Pancake, 55-250mm 3.5-5.6 IS II, 18-55mm 3.5-5.6, a minolta Auto280PX flash and 2 Minolta lenses. I am a bit confused as to whether the 70D would be the ideal upgrade, or possibly holding off to the 7D Mark II!
I take pictures of my friends and RC cars. Currently, with the T2i I can definitely take pictures of people, but I find the camera really struggles with moving subjects. I know the T2i isn't really geared towards sports photography, and in my own experience I found this to be true. While taking pictures of RC cars I can only get about 40% of the shots actually in focus (AI Servo and center point) and it's a bit disappointing.
Here's an example of the RC cars:

IMG_9858 by THGBrian, on Flickr
Here's one that is out of focus:

IMG_9826 by THGBrian, on Flickr
They move VERY fast!
With stationary objects (people) there is absolutely no problem:

Porsche GT3RS by THGBrian, on Flickr
I am looking for something that will be able to get these shots in focus, have better low light focusing, and possibly better low light performance.
I have considered the following:
Don't do anything at all! (Parents would love this!
)
Purchase a few fast primes. (Sigma 50mm f1.4)
Buy a Fujifilm X-E1 due to it's size and low light performance. Then down the road, buy a 7D Mark II or some "upgrade" to my T2i. <--- Most money spent here
Buy a Canon 70D during black friday. (No tax day at two of my local camera stores)
Wait for a 7D replacement
I really like the autofocus and video features that the 70D has (touchscreen!!!), as I like to make videos. However, with the possibility of a new 7D replacement that will only improve on the 70D (without the touchscreen and possibly wi-fi) I am really not sure if I should purchase anything at all! I'm not trying to sound like some rich kid, as I do work to get these items.
Maybe I should be grateful that I even own these items and hold off until I really need a camera. Thanks for reading!
If you guys need any more info, please ask!
The T2i is capable of capturing moving items with sharp focus. There is no camera available that will track focus for a vehicle speeding away from you at high speed.
If autofocus won't track, pre focus on a area that the vehicle will pass, and use a high shutter speed. You can also stop down to improve the depth of focus.
I happened to be browsing thru a few National Geographic Magazines from 1919 yesterday, and several bird in flight photos, as well as photos of sporting events caught my eye, there was no such thing as autofocus in 1919, so photographers used their skill, depth of field, and timing to capture the critical instant in one shot. There was no second shot until you pulled out the plate and popped another in.
Develop your skills, and your camera will do a superb job.
Good luck, and don't get caught up chasing a perfect camera, it doesn't exist.