reasonable priced 4k video cards coming soon?

Depends on what your definition of "reasonable price" is. The higher end Pascal cards (GTX 1080?) should have enough grunt to run most games decently at 4k res if their rumored performance numbers are to be believed. Expect to pay around $500-$600. If you talking more along the lines of the mainstream $200-$300 cards. Then you're not going to see that for another 3 or 4 years.