A delay of about ten days before the phone lands on shop shelves is in line with Apple's standard release schedule.
For what it's worth, the same launch event is also tipped to see the debut of the iPad Air 3 and the Apple Watch 2.
How much will the iPhone 5SE / iPhone SE cost?
Update: iPhone SE prices start at £359 for the entry-level 16GB version and £439 for the 64GB edition.
The iPhone SE's price is yet to be announced. But going by the day-one pricing of its predecessor the iPhone 5C, we'll hang our hat on a starting price of £30-£35 on contracts, with nothing to pay upfront.
Naturally, if you're prepared to pay a bit upfront you'll save a bit on the monthly contract price.
Think you want to buy the iPhone SE outright without a contract? Once again, we can't say for certain how much cash you should prepare to part with. But past form and the price of the iPhone 5C suggests you should probably expect to pay about £470.
That said, we've also heard talk of a price in line with the current asking price for the iPhone 5S. In which case, you're looking at £379 outright and £25-£30 on monthly contracts.
iPhone SE rumours round-up
Update: We know now everything there is to know about the iPhone SE. You can get up to speed fast with our 5 point guide.
From 'known knowns' to 'known unknowns' and even some 'Christ alone knows', here's everything we think we know about the iPhone SE.
Extra sizer than sizeway
Not everyone wants a super-sized smartphone, such as the five-inch iPhone 6 or 5.5-inch iPhone 6S Plus.
For that reason the iPhone 5S is expected to retain the same dimensions at the iPhone 5C and come in at a compact and bijou four inches.
Room at the top
Signs are that the iPhone SE will come in 16GB and 64GB options. The latter marks a major step up in storage capacity for an iPhone pitched as a mid-range phone.
Colour me bad
iPhone SE colour options are expected to include silver, space grey and rose gold, bringing Apple's cheaper phones more in line with its high-end models.
It seems the days of the iPod-style primary colours that marked out the iPhone 5C are gone for good.
The iPhone 7 is set for a major camera upgrade this year. Not so the lower-end iPhone 5SE, though.
It's purported to feature the same 8-megapixel and 1.2-megapixel snapper at the iPhone 5S and iPhone 6.
However, there are some changes afoot. Not least the fact that it will reportedly support Live Photos. This was the feature of the last-gen iPhone that captured moving footage before and after still images you took. It also lets you add music.
The camera will also let you capture larger panoramas and will include autofocus for video recording.