New wierd match ups for rank 3..?

So twice this week now i did a solo ranked search for 3v3 and when I was in hero select, the match was set up in the way a full party vs another full party is, banning heros and such.
The most incredible thing was the experience bonus for your rank, just now after winning I went from half way in tier 5 bronze to half way in silver. The same was for the previous game I played this week.
Is this a promo or something?

This is due to accelerated Visual Skill Tier gain, which is supposed to off-set rank decay at the beginning of a new season.

If you ask me, they could just scratch both and be in the same spot (without confusing players), but oh well…