@Bobajob - Hello. From what ever you have mentioned in your question, I am able to understand that you are currrently in a project but would like to work on one of the other two options. Now my question is, If at all you know that you are going to be employed in January, why did you even commit to the third project? Do you see any potential difference in the third one as compared to first two?

Next thing is, identify the right job that fits the most to you. Not just your dream company can be an attribute. Jot down other pros and cons and decide upon one choice you would pursue with.

Thirdly, if you would like to make a shift to one of the first two jobs, please don't let them know. when you get a confirmed offer letter from them, think twice about your decision and then let the employer know about your choice.To my knowledge, you cannot work on two companies together simultaneouly. So you might have to face your current employer to leave your job(If you decide to get different) and accept the new offer silently.

The below link is not completely for you but partially descripbes how to handle a manager about another offer

http://www.career.vt.edu/jobsearchguide/MultipleOffers.html

http://www.theladders.com/career-advice/should-you-tell-one-company-youre-accepting-another-offer

Hope this helps!

From whatever you have mentioned in your question, I am able to understand that you are currently in a project but would like to work on one of the other two options. Now my question is, If at all you know that you are going to be employed in January, why did you even commit to the third project? Do you see any potential difference in the third one as compared to first two?

Next thing is identify the right job that fits the most to you. Not just your dream company can be an attribute. Jot down other pros and cons and decide upon one choice you would pursue with.

Thirdly, if you would like to make a shift to one of the first two jobs, please don't let them know. when you get a confirmed offer letter from them, think twice about your decision and then let the employer know about your choice.To my knowledge, you cannot work on two companies together simultaneously. So you might have to face your current employer to leave your job(If you decide to get different) and accept the new offer silently.

The below link is not completely for you but partially describes how to handle a manager about another offer

http://www.career.vt.edu/jobsearchguide/MultipleOffers.html

http://www.theladders.com/career-advice/should-you-tell-one-company-youre-accepting-another-offer