So after yesterday's email, I received this from RS today:
Dear customer
Congratulations! We’re contacting you to let you know that we're shortly going to invite you to place your order for a Raspberry Pi. We now need to get a few more details to tell us where you want your Pi delivered to. This will help us get a Raspberry Pi to you as quickly as possible.
To help ensure as many people as possible can experience the Raspberry Pi concept, we are initially limiting boards to one per customer, on a first come, first served basis. To make sure we're able to invite you to place your order soon, please complete this information by Tuesday 20th March 2012.
When I followed it I was prompted to fill in my personal details, although most of them were already filled in (NOTE: This isn't the machine I registered my interest from). So, some more progress it would seem, with a new date – 20th March.
Progress perhaps?
EDIT: Admins, I realise you're moving these sort of posts to Off Topic, but I figured this offered a bit more definitive info on order dates.... move away if you think it's not relevant