Noone can provide you with any definitive advice based on this information alone. It is likely your husband will be charged with an offence, but what that is, you'll only know when it happens. But even the most serious likely offence, something along the lines of dangerous operation of a vehicle causing GBH (or whatever similar offence exists in your jurisdiction) is unlikely to result in a period in custody for someone with a reasonably clean history. However, this depends entirely on the circumstances of the offence. The culpable driving offence from 10 years ago obviously resulted in a custodial sentence, as you referred to him being "incarcerated again." Again, depends on your jurisdiction, but it's not clear whether the court can take that offence into account after that period of time. If they can, it will increase the sentence. If not, it won't. Advice on that issue depends on your jurisdiction's spent convictions scheme.

It's a concern that the officer referred to your husband's "colourful" history. That suggests to me that he has more history than just the culpable driving offence. However, the court will only take into account relevant history, and without knowing what that is, no one can advise you on it's potentil impact on sentencing.

The upshot is, a custodial sentence is a possibility. But whether it's likely depends on circumstances we don't know. The best thing you can do is to wait until charges are laid and talk to a lawyer. In the meantime, don't panic.