Hi,
Thank you for your question.
We checked with our team, and it looks like the A1300 may receive an update sometime in Q3/Q4 this year, although it will most likely still be based on the v4.5.x firmware.
In the longer term, we may release a new mainline firmware for the A1300 based on vanilla OpenWrt + the GL SDK, similar to the v4.8.x-op24 series. However, this is currently a lower-priority project, so it will likely take more time before our testing resources are available.