It's been interesting at Shenzhen Xunlong Software CO. They still make much of their successful boards and yet they had added to the stable.
 
Following the lead they did with the Orange Pi Zero by making a H3 and H5 versions of it, many of their successful board they released a "2," "Plus" or "+" version of it. This means that the board remains the same as much as possible but the CPU and RAM has been upgrades and increased where they can while they try to keep the price as low as possible. Here is what I seen of the following:
 
O-Pi PC - several versions have came out in the last 2 years, a couple I have mentioned - the O-Pi Win, O-Pi Prime, O-Pi PC II, O-Pi-Plus, etc The O-Pi PC used a H3 CPU with 1 (or 2) GB of RAM. The others were upgraded with H5 CPU except for the PC II which was given a 8GB FlashRAM to put an OS on (already comes with Android on it). The O-Pi Win and O-Pi Prime (I think) also comes with 8GB of FlashRAM in it as well. The O-Pi 3 has a H6 CPU on it along with a few extras on the board.O-Pi Win Plus comes with a H6 CPU Upgrade. The prices here for the new upgraded boards are within $5 - $10 from the original price. (Though I did see one place online selling the O-Pi PC for $55 when most sell it for $35 or less. Go figure.)
 
O-Pi One, Lite, Zero and other small boards - most received an upgrade to 1GB of RAM and a H6 CPU upgrade. The O-Pi Zero, depending on which one received an H5 CPU but one model (O-Pi Zero Plus 2) received a 8GB FlashRAM upgrade to install an OS on it though it already comes with Android on it. The upgraded Zeros all still have 512MB of RAM. The prices of these boards remain about $5 higher than their original boards.
 
The O-Pi IoT series seem to have an H4 Upgrade, when their first one came with a H2 as an original set up years ago. From 1 board they added 3 more to their stable of IoT systems which one can build cellphone and cellphone like systems controllable from a web connection.