There's no a big difference, but I try to explain it:
Ilyen korán: imagine that you wake up at 5 am, and you see your wife/husband drinks coffee in the kitchen. You ask: 'Mit csinálsz ilyen korán?'
Olyan korán: you're talking with one of your friends, and he says he gets up at 5 am every day. You ask: (Miért?) Mit csinálsz olyan korán?
You have this symmetry of [front vowel - this way] and [back vowel - that way] quite often in Hungarian. Most prominently with ez / az and their relatives, or the itt - ide - innen / ott - oda - onnan directives.
Note that the words are ide and olyan, though. Vowel harmony is really important.
Yes, the -sz suffix represents the 'you' conjugation, second person singular. For csinál the conjugation works like this:
I do - (én) csinálok
You (sg) do - (te) csinálsz
He/she/it does - (ő) csinál
We do - (mi) csinálunk
You (pl) do - (ti) csináltok
They do - (ők) csinálnak
Positive, for a course to proceed from the beta stage, it has to fulfil a specific set of requirements. I think it was something like "there mustn't be more than 2 error reports per 100 active users for 20 consecutive days." The Hungarian course has some notoriously complicated sentences in its middle part, so it never met that requirement.