Yeah they both come out around the second half of the year. Broadwell is high speed ddr3 and skylake is going to have ddr4 and a couple of other new features. You can't actually buy a motherboard for skylake yet anyway.
Nothing really to worry about though if you think you might miss out on one or the other. An i5 4440 is brilliant and you won't get much benefit from waiting to upgrade.
Once you have an i5 you'll find that the quality of your performance in games will be dependent on the graphics card, and it won't be the CPU bottlenecking performance. Whereas with the i3 you might find it holds you back a bit in the future with it not being a quad core.