MSDN makes it seems you can install SQL 2014 on 32-bit systems:
Hardware and Software Requirements for Installing SQL Server 2014
On the preview site, I see the following:
Previews
ISO 64-bit and 32-bit
CAB 64-bit and 32-bit
SQL Server 2014 CTP2 on Windows Azure
Why you would want to install a memory-intensive database engine on a 32-bit machine seems a mystery to me.
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MCSE Business Intelligence - Microsoft Data Platform MVP