The Galaxy Tab S4 may or may not offer the features some of us would like to see, but it sure looks to be on track for an official launch in July like its predecessors (except the Tab S3, which came out earlier because of the Note 7's cancellation). The tablet was certified by the Wi-Fi Alliance at the beginning of May, and it has now managed to grab Bluetooth certification as well. The Bluetooth certification lists the name of the device in plain text, so there won't be any surprises on that front whenever Samsung unveils the Galaxy Tab S4.
Galaxy Tab S4 Bluetooth certification
Also confirmed is the presence of Bluetooth 5.0, which suggests the Tab S4 will be powered by the Snapdragon 835 SoC. We will probably not see an Exynos variant if we go by the Galaxy Tab S3. It's not impossible given Samsung did release both Snapdragon and Exynos variants of the original Tab S and the Tab S2, but that was a different time and the tablet market has been on a downward spiral for a few years, so making two variants with different chips might be too much work for the company here in 2018.
However, judging by a benchmark listing, Samsung may go back to a 10.5-inch display with 16:10 aspect ratio with the Tab S4. But it's just one benchmark, so nothing can be said for certain. The benchmark also listed 4GB of RAM, 64GB of storage, 13-megapixel and 8-megapixel rear and front cameras, and Android 8.0 Oreo for the tablet. Both LTE and Wi-Fi variants will be offered, even though the Bluetooth certification is only for the former right now.
As for when the Tab S4 will be released, we can expect sales to commence sometime in September as they have for the Galaxy Tab S and Tab S2, though it will ultimately depend on when Samsung unveils the device.