Just signed a lease and now landlord is saying we might not be able to move in!

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Last Friday Me and my room mates just signed a lease to be tenants at will. We were supposed to move in on September 5th but I just got a call today from the agent (landlords representative) saying we might not be able to move in at all.

The current tenants are in the process of closing on a house, but there is some possible title trouble and if the sale does not go through, I was informed the current tenants will be staying in the apartment.

Is the landlord/homeowner required to rent to me? We passed all the credit and backround checks, the agent even came to our houses to make sure we were who we say we are. 

Thanks in advance for any and all help. Feel free to ask any questions I will be on here all night to answer them.