Are we sure that vocabulary won’t be a factor? Here is an interesting take on it:
http://edisonprep.com/pages/blog.html#020114
Note: I have absolutely no relationship with Edison prep. As far as I can tell, they are in Atlanta – I am in NJ. I just came across their blog thru twitter.
I do agree with their recommendation that current sophs make every effort to be done with the SAT before it changes. But OP is an 8th grader. My advice: stay calm, start looking at the new tests when they come out and ramp up your prep in a year or two. But also, work hard at traditional math. You are going to want to know about trig (including radian measure), imaginary #s and more about functions and algebra than you would need for the current version.