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Swiftkey already learns quite well. For example, I often type "Hey what's going on?" and it has now learned that if I type "Hey" it should suggest "what's" and so on, so in 4 taps I have the whole sentence.

What it doesn't have, is the context-aware switching. That is something really neat about the new keyboard. Switching context from a meeting being "postponed" to "boring" is great.

[maaaats]

And the keyboard on Windows Phone is also really great, especially in WP8.1. So Apple needed to improve the keyboard, they were already far behind the competition.