Hi Karim,
No, no, no and possibly, but no roadmap. (Sorry to not be more encouraging!). (We once produced code for 3. But, it’s very complex, and requires your plugins to be network-compatible – which not all are… so we expected a lot of support requests – we don’t want to dilute our brand by shipping stuff that people think is faulty, when really the whole idea is rather hackish, because WP wasn’t really designed to do 2 or 3).
If/when we do go for these, probably 1 will come first. But, as I say, no promises or roadmap…
Best wishes,
David