LG announced their 2018 OLED's:
http://www.avsforum.com/lg-oled-tvs-ces-2018/
Outside of image quality improvements, their big push seems to be voice control with their new processors and the integration of Google Home / Google Assistant into the TV itself so it can act as a smart hub.
The new TV's will support 120fps content, but sadly only over USB as they do not support HDMI 2.1. Hopefully they at least will support VRR for the Xbox One X?
Not too surprising since the HDMI 2.1 spec took a bit longer than people anticipated, so hopefully the 2019 OLED sets will support it fully.
1) Pricing isn't always announced at CES. Based on LG's announcements today, there are pushing 4k HDR into lower end sets (not OLED though), but again, no pricing is known.
2) Yup. March-June availability generally for new sets. Superbowl is the last big push from retailers to get the previous year models out the door with great sales and make room for 2018 models so they always wait until after that's over. If you're looking for a new set, it can be a good time to buy, especially since the 2017 OLED sets are still amazing.