A mail has been sent on February 14 addressing this. This is the most relevant part:
Hi Everybody,
Our team on 3 continents has been working hard to get your the Photon of your dreams this spring. However we have run into a PCB issue that has caused a short delay in our first run. This means that delivery will now be at the end of April. We're disappointed about this too, but we want to make sure we deliver a fantastic product that is great as it can be.
Keep in mind that we won't charge your credit card for Photons until we ship, so if you don't want to wait around for a few extra weeks, you can cancel anytime.
Once your order is fulfilled, an email will be sent to you.
Your order has been charged $xxx.xx.
This means that your order will be shipping shortly. You will receive an email from us with a tracking # within the next 2 business days. Be sure to check your spam folder if you don't see it.
A reminder that If your order combines current and pre-ordered products, your order has been charged in full and everything currently in inventory will ship. Your pre-ordered items will follow separately.
Order Details
Hey @cspencer, if you want to check the status of your order feel free to send me your order number and I can give you an estimate on when it will ship.
Can someone provide a URL for the “Order Lookup Page” mentioned here. I can’t seem to find it. Also waiting on my Photon ordered in December and would like to check on it.
I’m sorry there have been so many delays for your Photons, but I assure you they are arriving from China as we speak and we are turning these around as fast as possible. The best way to handle specific inquiries on your order will be to email hello@particle.io and our support team can assist you! What I can tell you right now is that all orders will be shipped by the end of June. When you ordered your product and what other items you have in your order will determine when in June your order will ship.