HTC hasn't had much luck with tablets so far. The company tried its luck a few years ago, but eventually decided to cede the market to the competition.
Now it's back with the new Nexus tablet, codenamed Volantis. http://www.fudzilla.com/home/item/35042-htc-volantis-tablet-leaked However, @evleaks reports that the company is working on a couple of additional tablets.
"Besides the T1 Volantis/Flounder/Nexus 9, HTC is developing two other tablets: the T7 and T12," tweeted evleaks.
The trouble with the latest leak is that there is no word on what the codenames actually stand for. HTC is rumoured to be working on a Tegra K1 tablet with a spec very similar to that of the Volantis. This is mostly speculation, but it makes sense. In the past Asus has released a number of tablets with some Nexus 7 DNA, so HTC could be doing the exact same thing. That could explain the reasoning behind at least one of the tablets, but we've still got no concrete information on either of them.