No, this is not a planned change. They really don't intend for people to use the weather screen for navigation. The normal plotter screen would be recommended for navigation and the other modes.
For TZ Touch 3's, I'd look into picking up a BBWX4 and subscribing to SiriusXM Fish Mapping plan that was recently introduced. You can get that SiriusXM provided real time SST info and a full usable plotter app with FM - which can be easily oriented in either mode NU or HU.
If in product development testing, the weather page for example did not render very nicely in a quarter screen (or it really didn't look good) than likely that is why it was left out by design.