We made some changes for engineers in PTR 3.2 and will be published in next build,I'm glad to tell you in advance,as usual.Some of the changes may not appear in the next build,so please wait until the 3.2 patch been published officially,here's the Engineering part,and will be appear in the patch note

　Engineering

　　New Mind Amplification Dish for helmetallows engineers control others,with limit of:not in arena,sometimes reverses targets,cannot stack with other helmet enchantings.made your hair looks special.

　　Added a design paper of Goblin Welding Beam that can heal friendly mechanical or vehicle units

　　Alert Bot function has changed. With materials required reduced.

　　Box  Bombs no longer requires base.

　　The Cobalt Frag Bomb now paralysis enemies in 3-yard. A short cast time was added, but they cna be used when moving.Now a set of material makes 3 at a time.

　　Engineers can create a portable Wormhole Generator for Northrend now.it allows them to travel to different locations in Northrend, some locations maybe dangerous.

　　Increased effect of Hyperspeed Accelerators, Hand-Mounted Pyro Rocket and Reticulated Armor Webbing glove modifications.

　　bonus of Springy Arachnoweave, Flexweave Underlay and Nitro Boosts increased

　　Increased damage of Saronite Bombs and the Global Thermal Sapper Charge.

　　Mote Extractor now can tracking gas cloud,taking from goggles

　　A new repair robot called Jeeves added,can be used to repairing, selling and buying.Engineers can link to their bank from Jeeves,it will not be destroyed after use,and can be summon once an hour.

　　Nitro Boosts: Now have a 5-second duration.

　　Engineers can be benefit 25 more from Potion Injectors

　　Reduced the materials and cooldown of engineering Dragonlings but they still cannot be used in Arenas.

　　Reduced the cooldown on MOLL-E greatly.

　　The former belt attachment changed to a Frag Belt.which can produces a Cobalt Frag Bomb periodically that can be used from the belt every 10 minutes (never runs out!).

　　A Steam-Powered Auctioneer has been added to the Dalaran,only interact with Grand Master engineers

　　Transporter devices can be used directly from your inventory.