The original Small World was a pretty fantastic (and faithful) port of a great board game. Of course, a lot of time has passed and the physical edition has received quite a number of tweaks and added content. Being the pinnacle of awesome that they are, Days of Wonder have released a massive (and totally free) update, dubbed Small World 2, that brings the original release up to speed.
Small World 2 incorporates a ton of new content. We're talking larger maps (for 2, 3, 4, or 5 players), pass-and-play support for up to five players or one player and four AIs, online play that can be in real time or "turn-by-turn," local play across multiple devices via bluetooth or wifi, and 20 new races/powers to use.
It's looking like a fantastic upgrade to the original, I'd say!