Starting to look like the next Anbernic device will be another RK3326 device called the RG351MP (Metal Pro?).. before we get the RG552.
From the information available it looks like another horizontal handheld upgrade to the 351P/M but this time with a proper 4:3 640x480 screen which is pretty exciting.
Personally I wasn't a big fan of the screens on the 351P/M so this is a welcome move to have a horizontal handheld to match up with the 351V. No word on price yet but I expect it to be around $140-$150.
RK3326 devices are starting to get played out at this point but this should still be a good option for some people.