Apple today registered two unreleased iPad models in the Eurasian Economic Commission (EEC) database, using the model identifiers A2200 and A2232,...
www.macrumors.com
A2200 - iPad 7 WiFi + Cellular (US/Canada)
A2232 - iPad 7 WiFi
Apple has registered five unreleased iPad models in the Eurasian Economic Commission database today, including A2068, A2197, A2198, A2228, A2230,...
www.macrumors.com
A2068 - ?
A2197 - iPad 7 WiFi
A2198 - iPad 7 WiFi + Cellular (Global)
A2228 - ?
A2230 - ?
There is also another one not mentioned in those articles: A2199 - WiFi + Cellular (China)
The new one is A2229, which is sequential between two of the other unreleased models, A2228 and A2230.
That gives us a total of 4 models listed which are as yet not released. However, I betcha there are some other ones too that haven't been mentioned, since there should probably be a total of 6-8 model numbers to account for the iPad Pro 11" and iPad Pro 12.9" (as in 3 to 4 models per size of iPad Pro).
I guess the other possibility is that all the cellular models have a global 5G chipset, meaning they would only need two models per size.
And the last point is that they are all listed to be running iOS 13, so their release would likely be before October.