Hi there,
I'm so sorry they're making you wait for your husband's review result.
If you have a read through this thread you'll find that quite a lot of other people were in your position (for themselves or their partners) and as far as I recall, they all got a higher award eventually.
By all means start another thread but I have a feeling that all the answers you're seeking are on this one.
PIP reviews (from what I have gathered from this thread) seem to take longer than original claims. I don't know why that would be.
Also - it seems to depend on what area of the country you're in as to how long they take to get back to you.
If I were you I would ring them and ask what is happening.
Just a warning - I expect you know this anyway - some people do get knocked back (although from what you say your husband would be entitled to a higher award) and the important thing is not to give up.
If you're declined, make sure you do the Mandatory Reconsideration, and if they decline that, go for the tribunal. Over 70% of tribunals are won by claimants.
I had to go to one, and it was very stressful, but I eventually got PIP, almost a year after I first applied for it.
Good luck - and keep posting. Give them a ring and see what they say.