It's hard to imagine anything being significantly better and, even if it is, I cannot imagine it is necessary. The old FUEL drill will break your arm and the compact impact driver is ridiculous for driving fasteners.
The 4.0Ah batteries are way more than necessary, also. Even on the circular saw, they are plenty sufficient.
It depends on how much you want to spend, how you use the tool and how often you use the tool.
There is a significant change in the driver electronics and communication with the battery.
The impact driver adds a "self drilling screw mode".
Both drill and impact driver are slightly smaller.
You will probably get more run-time out of the latest models.
There is also an updated grinder coming out.
If the OP wants to keep the tools for a while, and if the cost difference is manageable, yes, I would get the most current versions.