First half of 2020? Basically waiting for up to 9 months. Maybe up to a year. Any word on IBIS?
And most important question (which I'm asking myself) - should I maybe buy A7RIV?
To be fair if you want a camera now that has a high mp count the A7Riv is a great option and you'll have a camera that isn't vapourware. Further to this, you can always sell it when the Canon body comes out. You'll lose some money but no more than you would through normal devaluation.
I'm also taking the same outlook on the pro mirrorless. I find it hard to see that with 2020 being an olympic year that we're looking at late 2020 for the pro bodies and 2021 for the X mirrorless. I love my Eos R's but they're a compromise. The A7iii has all the features I need, colours are pretty much on point now and the lenses available aren't stupidly heavy (and cheaper) than the RF versions.
There comes a point when yes, the glass is great but they are neglecting the needs of users. i.e. the 85mm 1.8 was launched 27 years ago and hasn't been updated since and I really worry that if they do an RF version it'll be a crappy STM one because I'll probably walk from Canon at that point because STM is not the way I want to go.
So while we have a lightweight rf35 its focus is via slow STM, the macro function makes it hard to focus on low contrast items at a distance and on the dancefloor the STM can't react quickly enough to follow subjects compared to USM. I now adapt the EF F2 35mm IS and that nails it.
Sony has modern 35, 55 and 85 1.8 lenses. Why the hell don't we have L versions of these focal lengths at these apertures yet. I really can't carry 10 kg of kit for 10 hours at a wedding. But thanks for the super heavy RF lenses all the same Canon. Studio users seem to be your target right now. Screw those of us shooting weddings.
Sorry, I started to rant...