So at first, Lisa's solo was accidentally confirmed by Yoon Jae Suk. He said July. That should be confirmation enough, at least as far as other companies are concerned, but you never know with YG.
Then we saw unoffical pictures of Lisa with short blonde hair a few days ago. This hairstyle has not been officially shown anywhere, so I am very sure that she has already shot the mv.
Now only two questions arise. Will it be just a single or a single album? Blinks strangely assume that it will be a single album, but YG never mentioned that.
But let's assume a single album. Rose had promo for -R- about a month before. Considering that Blackpink have their anniversary in early August, I doubt we'll get a single album in late July. That would be too close to Blackpink's anniversary.
I strongly suspect that we'll only get a single for now, like Jennie with Solo. I doubt YG will let Lisa come back on 09/07. The promo period from now to then is too short and BTS will be back that day too.
I claim that the 16.07 would be the perfect day. So Lisa would have her promo phase without being too close to Blackpink anniversary.