Good question Paulo, and it looks pretty grim in Salvador at the moment (the polcie have gone on strike and it's anarchy - 78 murders in 5 days!)
I've just written a travel alert about the situation
Carnival is still a couple of weeks away, so maybe the dispute can be solved before then and the police will return to the streets. There are almost 3000 troops on the streets of the city, which has had a calming affect.
I wish I could give a definitive answer, but I think it's in the lap of the gods. Best to keep checking the news and see what develops. You can also contact your hotel and ask them to update you on the situation.
If you do decide to go, this year more than ever is the time to follow some safe procedures (tips in the above article).
I'll try to keep you abreast of developments.
Phil from the safety hub almost 8 years ago