Yeah, the Men’s ‘Rider’ Pants (royal gold) have never been released before despite being in the Database for a long time. The price of the ELITE XX LEGENDS PACK that they’re in is actually a good deal when considering all the other items included in it.
As for those Cybernetic Arms, I think those are the ones currently available in the NES, which they’ve been for a long time.
Now about that ‘Historic Capsuleer Day Clothing Crate’, I have no idea on how to get that or where that is available. More than likely it contains old Capsuleer Day apparel items which I already have in my collection so I’m not too concerned about it.
Did you check out the Legacy Apparel Pack in the NES? It contains 20 different items from Men’s-Women’s Faction Marshal-Gunner Jackets to Footwear. Might contain some items that you don’t have in your collection. Plus there’s also a listing in the NES of 50,000 SP’s for free.
So it seems to me the only actual new item is the Men’s ‘Rider’ Pants (royal gold), available in the ELITE XX LEGENDS PACK or from the Market in-game.