5th generation iPad:
iPad Air.
http://www.apple.com/uk/ipad-air/
http://store.apple.com/uk/buy-ipad/ipad-air
Thinner, lighter, more powerful. Looks like a larger version of the iPad mini. Released on the 1st of November, replacing the 4th generation iPad's current price-points.
2nd generation iPad mini:
iPad mini with Retina display.
http://www.apple.com/uk/ipad-mini/
Same resolution as the full-size iPad with Retina display, with the same A7 chip as the iPad Air. Due "later in November".
For some reason Apple is still keeping the iPad 2 and iPad mini as well.