Tablets are not selling as much as companies would want, probably because the changes between generations of these devices are not as flashy or substantial as it is the case with smartphones, where designs change and upgraded processors bring noticeable benefits that impact battery life and performance. There's always been the intention of making tablets as powerful as PCs, as these devices are more portable and with recent accessories like Bluetooth-enabled keyboards or even some covers that include physical keys, typing on a touch screen is no longer an issue.
Some hybrid devices have been appearing, such as the Surface Pro 3, which features a 12-inch screen and processor options that would be found on regular laptops, plus, it runs the full version of Windows, so it's pretty much a laptop with the benefit of a touch screen and more portability. Apple is rumored to launch their bet at a larger screen iPad later this year, it would be possibly called iPad Pro, and aside the larger screen it is supposed to come with an innovative stylus and it could even run a version of OS X (software found on their desktops and laptops), rather than iOS which runs on the rest of the iPad lineup and their other mobile devices.
Samsung already has a Galaxy Tab Pro lineup of tablets that was released on February last year, including three tablets with screen sizes of 8.4 inches, 10.1 inches, and 12.2 inches, but the whole lineup was overshadowed by the Galaxy Tab S lineup which included tablets with similar specs (only the two smaller sizes are available), but the new ones were lighter, slimmer and more importantly, they used AMOLED technology on their displays, providing more saturated colors and excellent contrast.
Now, it has been reported that Samsung has registered the name Galaxy Tab S Pro in South Korea, which could be a larger version of the second-generation Galaxy Tab S tablets that are expected this year. Samsung already offers a split-screen view to work on two apps simultaneously, but perhaps they could improve the way it works and tweak some other parts of the software to make this tablet perform better and be considered as a laptop replacement along some innovative accessories.