Put an order in for Infinity over a week ago. Got told I would be sent a HH3. Actually got sent a HH4. Strangely they sent me the ADSL package. Same HH4, but I think just includes microfilters and slightly different quickguide (both quickguides available on BT help pages).
Got Infinity turned on yesterday. All working ok for a day. Then at lunchtime today I turned off the HH4 to move it and rearrange cables under the TV. After half an hour turned it back on. It all went blue to say everything was alright. However, all devices (laptop, BT Vision box, Android phone, PS3) now said no access to the internet. Eventually I rang BT and a chap overseas ran a full test of the connection from the exchange to my modem and HH4 router. He said everything was correct and it was connected at my max of 40Mbps. He didn't know why devices couldn't connect to the internet and suggested I wait and try again tomorrow.
After a few more hours I thought I might as well try a factory reset of the HH4. Did it and, bang, everything back on the internet again. The firmware version didn't change. So something on the HH4 was stopping my devices connecting to the net and a HH4 factory reset solved it.
When it wasn't working properly the log was full of these types of entries.
IN: BLOCK  Default policy ....
OUT: BLOCK  Default policy ....
BLOCKED 1 more packets (because of Default policy)
The HH4 includes a built in firewall, it could have been blocking your devices from connecting, it has happened with my HH3 before but I didn't factory reset.
Ordered Infinity on the 16th and Order Confirmation email says HH3. I've emailed them to see what they say but may need to follow it up with a call.
if im correct they dont send it out to you till a few days before the engineer is due
The expected delivery date for hardware should be clear on the order summary on My BT.
For me I think the hardware was sent out 2 days before the expected delivery date. I could tell because a Royal Mail tracking number appeared on the order summary once it had been sent out.
Going by the press release and ignoring the images shown on BT.com, I can't see why they're not sending HH4's.
On BTShop, the adsl version currently has 183 in stock, the Infinity version has over 200 in stock and if you want a used one, yes BT are already selling used HH4's, then they have them too for £25.96. The used ones only have a 90 day warranty.