The credit limit was displayed on the balance transfer page. Mine is $9,000 which I think has been mentioned by others earlier in the thread. I don't think they reduced the limit on another card. They are including No Preset Spending Limit on this card, which I don't recall as a published feature of any previous American Express credit cards.
Oh, I quickly skipped the Balance Transfer page and did not bother to take a screen shot as would not use that feature.
Since he does not have a MR account now, I assume a new one would be created automatically once the card is activated and linked to existing log in? Or must he create the MR account manually?