Will the deal that the Obama administration making with Iran increase or decrease the probability of war?

Increase based on history: Munich Accord and "peace in our time" which lasted about two years before WWII broke out when Germany invaded Poland after years of appeasement.

Need to see the deal first, however based on Obama's previous foreign dealings probably decrease the possibility for the short term but increase the long term possibility of nuclear war

Given that deal isn't finalized yet, can't answer the question with any note of truth. Also it would be a deal with a few countries, not just the u.s a few of them are getting hammered out currently.

Early stages of things being talked out, despite what the right wing nut who spoke to congress today said, things are still being talked about and no deal is even close to finalized yet.

Since we do not know what the deal is it would be hard to say right now. That said it sound like all deals will only delay it.

Neither. Whether or not we make a treaty with Iran, if they start a fight with the US, they will lose. If Iran attacks Israel, the US will respond as though America was attacked. If Israel attacks first, I say the US should stay out of it.

I think the objective is to decrease any war.

Hard to answer, because no deal has been made