Should I buy a Nintendo DSi within the next 3 months?

I have a Nintendo DS and want to get a new DSi (my DS is getting on in years). When is the product cycle over for the newest DSis that are out now? If i get one within the next 3 months, will there be a newer, slimmer, better version of the DSi that will come out soon after? I want to know if this is the best time to get a DSi and not get screwed with a newer and better model.