There's 2 things you need to consider.
1) if you need it now, and will put it to important use (school, work, etc) then buy it now.
2) if you feel like you don't need it now, and would like to have the newest piece of technology, then buy it. I'd consider this option if you don't NEED it right now.
Buy now if you need it, or wait if you don't.
Apple will drop the price when the new iPad Air becomes available.
Also, this should be posted under the iPad section of this forum.