I too was worried about the new visa regulations about having 5000 riyals or valid international credit card and hotel voucher upon arrival, as I have relatives coming out here in 2 weeks time. (Family and they are regular visitors).
I have been told by other people who have had visitors arrive that it's no problem .. still the same as before 55 riyals for 3 week visa on arrival (with option of renewing for the extra week at 50QR).

Fingers crossed.