If you're looking for a free upgrade it's not happening in the short term at least.
The new products will be available as of 30th March, and if you want to take advantage of them you will need to re-contract.
Alternatively just call up after the 30th threatening to leave and if you get the right retention agent they'll upgrade you to Vivid 1 beeeelion and send you a selection of illicit substances and ladies of the night to enjoy them with.
EDIT: Sorry got caught in the retentions rant. You should not be permitted 300Mb unless you have an SH 3 but, again, if you get the right retentions agent they'll likely try putting the configuration on a Nintendo Switch if they are desperate enough.