From the horses mouth:

Hey backers,

Plenty of updates today, so let’s hop in:

European Retailers
It has been brought to our attention that several European retailers received notifications from their distributors that shipments were on their way for items from the Kickstarter that are not due for release yet.  Our sales manager has contacted all distributors to put an embargo on those items, and to stop any shipments they can to stores. Our release dates were communicated in July, and we expect our partners to communicate and honor those dates. Thank you to the retailers, fans, and friends that reached out to us to tell us about these issues.

Fulfillment
During fulfillment, QML and its hubs, through no fault of their own, identified incorrect stock levels for items that had originally shipped from the manufacturers. Catalyst is working with QML to shift stock between warehouses and hubs.

Other than the stock shifts, The EU, UK, and AU hubs are still short a few items that were either in the US or were first shipped to the US before being parceled out to the needed hubs. The remaining short-stocked items are Catalyst’s focus for the week, and we expect to have those stock levels fixed quickly, including the House Arano Challenge Coin. These items are being sorted now into the needed shipments and we hope to begin international fulfillment in the near future. As these are planned to be resolved quickly, QML is going to wait for these items before shipping.

Parts Replacement
QML has now received the parts catalog and will be able to fulfill defective/missing parts replacements following the completion of full orders.

Art of War / BattleTech Cookbook
These items, for any backer who may not have received them, are being shipped separately from the rest of the orders and will be on their way following full orders. We are prioritizing full orders in this case to expedite the shipping process.

Store Credit
Backers who have not yet received their store credit, please message [email protected] for this issue along with the appropriate email address to send these credits to. These must be done in batches and we will be sending them out as soon as possible.

Segment 6 Fulfillment and Address Verification
QML will be sending out the next batch of address verifications on Thursday to run over the holiday weekend. If you have received your address verification email and have still not received your pledge, please do not worry, as these are sent out in advance to give backers ample time to reroute their order if necessary.
Thank you backers for your patience as we work to fulfill one of the largest Kickstarters out there!

Notice the absence of any specific date? Stop holding your breath! This could go on for some time. *sigh*

Source: https://www.kickstarter.com/projects/cgl/battletech-mercenaries/posts/4184781