Someone who visited the construction site the other day posted a few photos online and I'm not entirely sure but I believe these photos show the new transit station which is now beginning to rise above ground...
More interestingly though is another photo that this person shared of the layout of Universal Beijing Resort:
What's significant in this image is that I notice two very distinct changes to the design. First, the waterpark which is to the left of CityWalk now has a grey rectangle over part of it. This is speculation but I wonder if the grey rectangle is a building and so the waterpark will be partially indoors. Second, and even more significant is at the theme park itself next to Wizarding World of Harry Potter - Hogsmead was originally a large area with nothing which would be used for a future expansion. Now in this new layout something appears to be there. The location in relation to Wizarding World of Harry Potter - Hogsmead is exactly where the new roller coaster is being built at Universal's Islands of Adventure in Orlando. This is total speculation and not official, but I suspect that the new coaster coming to Islands of Adventure is also coming to Universal Studios Beijing and will be opening at the same time as everything else, not as an eventual expansion.
Comparison:
Source: https://m.weibo.cn/status/4261844719600266