A mildly updated version of Toyota's minivan will be revealed this Thursday.

Toyota has taken to Twitter to announce that the 2015 Sienna minivan will be unveiled on Thursday, July 17.

Just what the 2015 model year will bring for the Sienna has not been officially revealed, but Edmunds reports that a midcycle freshening is likely.

That means minor detail changes inside and out could be in store for the Sienna, which launched in its current generation for the 2011 model year.

At present, the Sienna is offered in a quintet of trim levels ranging from the $27,780 L to the $41,100 Limited, all of which are powered by a 3.5-liter V6 that produces 266 horsepower and 245 lb-ft of torque. Front-wheel-drive is standard, while a class-exclusive all-wheel-drive system can be spec'd as an option.

Though not quite a hotbed of sales growth, the minivan segment has seen a decent influx of new and updated models recently. Aside from the upcoming 2015 Sienna, activity has included the debut of Kia's all-new Sedona, along with the market launch of the revised, vacuum-equipped Honda Odyssey. A new Chrysler Town & Country is expected in 2016, complete with a nine-speed automatic and available all-wheel-drive.