Samsung's 2015 tablet lineup leaks; four new Android slates on the way14
The Galaxy Tab AS Plus SM-P350/351 is probably a 7-inch or 8-inch mid-range slate belonging to the Samsung Galaxy Note tablet range. The Galaxy Tab AL Plus SM-P550/551 is believed to be a 10 to 12-inch mid-ranger belonging to the same line. We can come to that conclusion considering that the current Samsung Galaxy Note and Samsung Galaxy Note Pro tablets are wearing SM-600 and SM-900 model numbers. Again, the first model number (like the SM-P550) is the Wi-Fi only version while the second number (SM-P551) is the cellular version of the slate.
The new tablets are expected to launch in the second or fourth quarter of the year with Android 5.0 inside.
source: SamMobile via BGR