It's unclear whether players will be compensated for the delayed update, but it's likely that some Primogems will be given to those who were affected.
According to the most recent leaks by a leaker known as Uncle Y, no new banners will be available after Ayaka's banner leaves the game on May 11, 2022.
Overall, more clarity on the 2.7 delay is to be expected following HoYoverse's subsequent announcement.
An unofficial announcement on Facebook and Bilibili's comment sections informed players of the delay in the 2.7 Special Program.
On April 28, Genshin Impact announced that the 2.7 Special Program would be temporarily rescheduled to an unspecified date.