This sounds like what I’ve been hoping they’d do: treat longer-than-140-character posts as an attachment type, like quoted tweets, images, etc.
An idea for a service I’ve been idly considering for some time: Capture part of a page, and if requested with an
Accept header that prefers images over HTML, show the text as an image.
This would be ideal for Twitter clients, although I’m not sure whether (any) Twitter clients actually explicitly prefer images over HTML. Considering how most of them embed images inline, I think they should, though.