Droid 4 is the most exciting Droid line Droid since the original, which i loved. It "should" be a 1.2 ghz dual core 4 inch LTE slab of awesome Droid.
I know how you feel. Had an OG Droid, went to the X, which I LOVE. However every time a slider comes out I get interested as i do miss an actual keyboard. To me, the limiting factor of a slider is Thickness, as well as the screens are almost always 4 inches while everyone else gets that extra .3 of awesome.
I was hoping the droid 4, since it is related to the RAZR, would be exceptionally thin for a slider, and still retain the 4.3 inch screen. If it had, i would have bought 2 i would be so excited!
P.S. Moto has been replacing phones so quick recently, if the Droid 4 just isnt enough, I seriously thing by next summer a Droid 5 will definitely be either out, or almost out.