When you ask a non-baseball fan what their favorite team is, what answer will you get?
They are the Yankees of Japan. Those in the know hate them, while casual attendees and folks just looking for a good night out with their friends cheer for the Evil Empire. But they are Japan's team, and (thanks to lots of money) frequent playoff participants, so people like them. And when people like them, card companies make more sets and bigger sets and more complex sets. (See also: Yankees.)
This year's team set from BBM is not very different. It actually hit shelves in late May, but you know how lazy I am.
As for parallels, I don't have any copies, but several of the cards in the regular part of the set have parallels which are serial numbered to 100 (gold signature), 50 (holo signature), and 25 (red signature).
Both Giant Future and Giants Pride have parallel versions with serial numbers - 100 (gold foil), 50 (holo foil), and 25 (some other form of holo foil).
Instead of autographs the Giants set contains foil autograph versions of the cross brand set, Cross Foil Signing. There are 18 cards in the set, and each is limited to just 15 copies.
An annual insert in the Giants team set is Super Metallic Giants. These cards are actual metal, and are obtained through exchange cards randomly inserted in packs. The nine cards seem to be serial-numbered to the player's jersey number, with a 1/1 black parallel as well.
Triplex is another super-limited insert found in this set, with the three cards each being limited to 25 copies. Additionally, Phantom, found in all of the team sets this year, is an 18 card set also limited to 25 copies each.
While there are no actual autographs in this set, there are some memorabilia cards. The seven-card checklist is serial numbered from 10-100 copies depending on the card. Four subjects each have their own card (100 copies each), plus two dual-relic cards (20 copies each), and a final four-swatch card (10 copies).
The Giants set is always the most complicated release, probably because there are no autographs. I guess BBM needs to add some other stuff into the mix to keep collectors paying 8000 yen per 20-pack box. That's 6 cards per pack, so about 75 yen per card.