Lightroom 4.4 will not support Canon EOS 70D raw files, no. You would need the latest Lightroom 5.2 for that - as you say.
However you do have the option to use the latest version (8.2) of Adobe's free DNG converter, which does support the 70D files, and will convert them to DNG "Digital Negative" files - which retain all the information of the raw files, but which is a more standardised "open" format, which Lightroom 4.4 will be able to import.
It's a bit of a faff -- but it's free, and will save you having to buy LR 5.2 (though there are other reasons why the upgrade is worth it - but that's conversation for another thread! ;) )