[NTG-context] Text streams

Hello there, some motnh ago I asked for a possibility to set a book in Context bilingual (with a left and a right column on every page). This environment should allow of course page breaking etc. I got this answer (by Philipp Gesang):

What you are looking for is text streams. They are not yet fully functional in mkiv. But as long as you need the streams to appear as columns on the same page, as seems to be the case, there is a cheap workaround using the *tabulate* environment (see below).

So my question: Are text streams now available in MKIV? Thanks. Huseyin