That roadmap is sketchy at best... Looks as if anybody could have created that in Excel. There has been nothing to suggest that the DX2 or SGS2 will be LTE. Especially considering the very thin nature of the SGS2, I don't know how they would be able to cram both radios into that form factor.
Also, the international SGS2 (i9100) was just announced for a May 1st UK release. We will most likely see a repeat of last year's i9000 release. First the international version, then a staggered release of the U.S. models. We very well could be waiting until late Summer/early Fall for a VZW SGS2 (Fascinate 2?)