Neat thing about the new design is that it is capable of producing switch types other than linear, so you can get the advantages of optical sensing with a wider variety of characteristics.
Left handed version looks silly to me-- it's basically a number pad placed where people who don't use the number pad would want it. But some people are fans of it anyway and it's good that such people can have an option.
Now here's hoping they release a variant under the X7 sub-brand as well, so that we can get it without that awful hand logo. I try to prioritize function over form, but some things just go too far...