Has anyone been able to actually file this year yet

Yes, but it's not recommended to efile this early. See the last paragraph below.  The main ones who have filed are people with 1040EZ returns, because several Federal forms are not yet available.  However, the Form 1040 and 1040A should be available for efiling in the next day or so.   Then it will depend on other Federal forms you may or may not need, and if they are available.   See these FAQ's:

Federal forms availability dates:
https://ttlc.intuit.com/questions/1908854-forms-availability-table-for-turbotax-federal-products-exc...  

State forms availability dates:
https://ttlc.intuit.com/questions/1908857-state-forms-availability-table-for-turbotax-individual-per...

The IRS will not start processing returns until January 29.  If you efile before then, your return will just sit stockpiled on TurboTax servers until the IRS starts pulling them on January 29 (except for a few test returns pulled early.)   You won't be able to retrieve the return if you notice a mistake, get an additional W-2, 1099, etc.   If you efile at this early point in time and need to change something, you'd have to wait until after January 29 to first find out if your return was accepted or rejected.   If rejected, you could make any change and resubmit.  If accepted, that would require waiting on any refund, then preparing an amended return, which can be a hassle.

Also, if you have EIC (earned income credit, aka EITC) or ACTC (additional child tax credit), the IRS will start processing them on Jan. 29, but will not start releasing those refunds until February 15.  That means people with those types of credits may not start receiving their refunds until around February 27.