It's a Monster World Collection, it even stays on the title menu, not a Wonder Boy Collection, hence the three Monster World games and no Wonder Boy or the two III games which are Wonder Boy games rather than Monster World games, yeah it's still a tad stingy but if they're planning on releasing them in 3's it's an obvious and sensible split for the series.
The Alex Kidd & Co. one makes a bit less sense, but all three games are good and when I was a Mega Drive owning youth this is the sort of thing i wanted - a perfect Super Hang-On port! I dunno, they were a bit pricey but all six games are great, play great and Monster World 4 finally has an official translation so they at all serve a purpose.
The two upcoming ones? Not so much, the Streets of Rage pack seems pointless and Golden Axe is a wasted opportunity, if it was an arcade perfect Golden Axe plus Revenge of Death Adder and The Duel, or plus Revenge of Death Adder and Legend or plus Revenge of Death Adder and ANYTHING rather than just 1, 2 and 3. I further support a new version of Sega Ages Volume 1 for the series though (After Burner II, Space Harrier, OutRun) and maybe a nice 'second tier' arcade game set - maybe containing Dynamite Dux.
Also Sega doesn't own Toejam & Earl do they? And i doubt they can still release things like Star Wars Arcade (I don't really get how it works today, UbiSoft were able to release two Konami TMNT games right? So maybe LucasArts could release Arcade or the original Star Wars arcade game, though personally I'd like to see the 2600 Empire Strikes Back first, the Parker Bros. one?)