If you're desperate for a monitor, but you may find the features of the X34P lacking when the PG35VQ lands... it does have an impressive spec, but I'd personally await reviews. We don't even know the price yet, and there is a big question mark over the ghosting/smearing issue which is something virtually every VA monitor on the market suffers with. If it does, the X34P may be preferable... but then again, if you get one with bad bleed/IPS glow, you won't be happy. The X27 is £1750... if you can afford it and have a 2080Ti, sure, why not.
There is also the Acer Nitro XV273K. Could be worth a look.