Rob, I have a consignment from my last order. As they're only small, it's impossible to tell any features on them yet, they just look like most young Neps.
Lowii seedlings, as far as I know, don't have hair ON the lid, and the hairs under the lid don't appear for a little while.
Rattler, as far as how hard it is to grow, it is the same as lowii in conditions, although faster growing than lowii. I've found muluensis to be a surprisingly fast growing plant, which is contrary to the experience of other growers. However, if your experience in highlanders is only veitchii and bongso, then it will be more difficult than both. The "highland" veitchii species are really intermediates, and bongso is an easy species which tolerates warm weather.