I don't think that they will considering the lackluster sales of the rog ally and even if they did (maybe in a couple of months time) people will mostly go for the rog as the legion will most probably cost over 60k or 65k and offers pretty much the same performance as the ally.
I mean, the next version is not too far away so even if they launch it at ~65K, it will be overpriced. A second-hand Steam Deck (or OLED) is quite a good VFM for the first generations of Handhelds.
Its launching on June 27 as per some websites if they price it well it should be good. But the ROG Ally X is coming up as well which should make this interesting