I had my combo interview January 15th, told I was approved and both cases were updated online to 'approved' the very next day. The officer said 3-5 weeks to receive my oath ceremony date. Well I woke up this morning to a text message saying there had been action taken on my case, so I flew out of bed and logged into my laptop, only to see the update is "Case is still being processed by USCIS". Little teasers!
I know it is far from it, but this feels like the longest wait, being the final hurdle.