You’ve been craving for that, you really have:

Yes, not only you can edit text on canvas in GIMP now, you can also use different styles in same text block. It’s as simple as selecting text and clicking a button. And full undo/redo works on text level too. All praise goes to Michael Natterer
There’s a lot of goodness in the brush dynamics department too: Alexia went ahead and started working on UI for response curves. So soon you’ll be able to tune your styluses for GIMP almost like in MyPaint.
And did I say that recently released GEGL and babl are experimentally threaded now, so re speed they are on par with legacy 8bit GIMP, while retaining 32bit float per channel accuracy?