Apple has registered a handful of new devices in the Eurasian commission database earlier this week, as discovered by Consomac. Legal obligations require devices that use encryption to be registered ahead of release. In the past, similar filings have tipped the hat on new MacBook models, the iPhone 7 and AirPods.
The latest entries represent two new devices, with model identifiers A1954 and A1893, which are described as Apple tablets running iOS 11. This suggests that new iPads are coming sooner rather than later.