I'll clarify a few things for you. 2012 & 2013 all have hyper threading. Apple rarely uses only one supplier for any components where more than one manufacturer exists. Thus they chose to use _both_ LG & Samsung for the displays on retina MBP's, and they are still using both.
There's always a lot of rumors, reports, and false reports about new models no matter if its Apple or whomever. Therefore some of what you read must be taken with a grain of salt.
I've had three 15" MBP retina models a few months apart since the first one I preordered upon release. Yes they had issues, some centered around LG displays, however they haven't stopped using LG, they have done what they usually do which is to work with the manufacturer to eliminate the issues as soon as possible.
Unfortunately Apple is not only a closed locked down eco-system, they are also a company that's famous for not communicating much of anything when problems arise. Most of the time a fix, or update simply appears. Then MacRumors or the other sites report on it once it's out.
So if you buy a refurb you may very well get an LG display. Or you may not, it's always a gamble with Apple.
That said I don't know of a better company when it comes to doing a great job on refurbs and I endorse them without hesitation. One person I know always buys refurbs from Apple. I've seen them, and I could not tell, they look & operate like new machines.
Honestly, I'd strongly advise you to get the 15" size it's a great computer.
not another one, in all likelihood the display will be fine, enjoy your Mac and forget about the nonsense, everyone and anyone with a problem gravitates to forums such as this, by far the vast majority are happy with their purchase. Obsessing about you computer is just a downward spiral, Mac`s are meant to be used and abused not venerated...
