What word could I use to describe a future project or collaboration that isn't guaranteed to happen?

I was emailing someone that I had talked with very briefly about collaborating on a project together. I hope that this person and I are able to work together, but this all depends on our schedules, how well we enjoy working together, and the subjects we both want to focus on.

What adjectives describe our project/collaboration? Is there a noun for this?

The exact sentence I wanted to insert the word into was:

Would you like to tell me more about your ideas for our [word] collaboration/project.

I'm not sure which word I would like to end the sentence with either, hence the "/".

I want to work with this person, so I didn't want to say: "our possible project", because I felt that I came across as indifferent as to whether or not we actually worked together at all.

I also didn't want to use the word pending because I felt as though I was pressuring the reader to respond and rushing the process so that I could remove the pending status.

EDIT

Why I chose the accepted answer –

I felt like the word proposed had the best fit because it didn't make the project feel like it really depended on something or needed something to be cleared up.

It put the least emphasis on the decisions or effort that had to make the proposed project, a real project.

I didn't choose pending because I felt like that was almost rude to say in this scenario. It sounds like either I should supply the information needed to make the project go from pending to a work in progress, or that I'm expecting the other party to now supply what is needed from their end. I didn't want to say "Oh hey, you remember that pending project? Yeah… just waiting on you to see about that…"

I didn't choose prospective because I thought that it was very similar to the case above with pending. It was the same as telling the other party you were waiting on them, but it was like telling them you aren't sure if you're going to go through with it or not. As if they have to offer some incentive for you to make up your mind.