A few days ago, @wyndwarrior ported the popular Android keyboard tweak, Swype, over to iOS via Cydia. The update adds the blue line, functionality for more apps, and it is much more responsive than below! So, yeah over to the Cydia Store and download the update!

Edit: looks like 0.3.0 was released before this was posted. It added a new suggestions feature in case the tweak gets the word you typed wrong. It’s a really nice feature!