The folks at DigiTimes have some new "rumint" to share. According to the latest parts supplier info, three different manufacturers are planning specific launches for the third quarter of this year purposefully to take on the next iteration of the iPhone directly. Here's a quote with the details,

Samsung is expected to roll out its Galaxy Note 3 in the second half. The new flagship model will be powered by a Exynos 5 octa-core processor and come with a 5.99-inch Super AMOLED display supporting 1080p Full HD resolution, indicated the sources.

HTC plans to release its next-generation HTC Butterfly 2 in the third quarter. The Butterfly 2 will have a large-size display supporting Full HD and a number of features such as BlinkFeed, UltrapPixel sensor and BoomSound speakers that are found in its latest flagship model, the New HTC One, launched in March 2013.

Having launched its latest flagship model, the Optimus G Pro, recently, LG is expected to release a new flagship, the Optimus G2, in the second half of the year. The Optimus G2 will come with a 5-inch Full HD display powered by a Qualcomm Snapdragon 800 processor, the sources noted.
All of these devices should be powerful, exciting new entrants to the smartphone world, and have great potential to put a serious dent in iPhone sales. We have Samsung filling out their lineup with solid new additions, and the two other big name manufacturers, HTC and LG, trying to regain a competitive edge against both Samsung and Apple. In the end, we the consumer end up the ultimate winners because we get the fruits of all their labor.

Source: DigiTimes