If you step back and think about X3, upgrades (Producer to Producer) were $149... the patches that followed were
not guaranteed for that purchase (remember X2??), but patches to X3 came pretty fast and furious, which was a real treat for us. As far as going forward, the $149 pays for a year (time period) versus a version (i.e. "X4") is actually more minutiae from that perspective. I would far prefer seeing the support we saw with X3 continue going forward, and it also benefits the bakers in that there is not a "self-contained" version to package at each development stage. To the folks who upgrade regularly, it is actually just a change in the name.
For folks who jumped onto X3 after the X3e patch was released (for half price)... they got the same thing I paid double for, so this new structure seems to also equalize this (at the assumption that the one-time price for 12 months doesn't become $75... which seems unlikely since there will not be a "new version" in the pipeline).