On ISP review it mentions the speed boost coming our way but no date.
Might be worth reading the news article again....
Virgin aren't dishing out a free upgrade they have just decided to stop selling 50mb, start selling 300mb and shift the pricing "for new customers down by £5"
Spoke to Virgin today as I was trying to get a free move to the 200mb Gamer service or the upgrade to 300mb for an extra £5 but due to the above it would cost me an extra £5 or £10 for 300mb.
I would assume if you reconstructed for the 100mb, they would honour new pricing but seems nothing for existing customers without new contract for the moment.
Connected at home and on the move by Virgin Media.