I wouldn't be surprised to see more consoles (I guess we can call it that?) like this, especially if this one sells (as has been suggested), but I honestly wouldn't be surprised either if Nintendo was leaving out some details in regards to ability to add games. Like, maybe adding new games isn't the plan right now, but if they see it sell well they announce something like, "Now you can add new games to this system! Pick up this cable, connect to the internet, and you can download these games at $X each / another set of games for $X!" Y'know...just not telling us that it actually does have the capability or that it's on the horizon. I don't know why they wouldn't tell us that, but it somehow seems like the kind of thing Nintendo would do.
Nonetheless, and limited collection or not, I want it! My wife and I have already discussed how it's somewhat pointless since I have a system that will play NES games, already own a few from the collection, and that I also want to own a bunch (or all) of the original NES cartridges anyway. Thankfully she seems to understand (possibly read as, "tolerate") my desire to collect retro-NES and SNES items.