There have been several attempts by rebel factions to promote unity in the area of the last few months. In late 2014, the Levant Front formed in order to stop a Syrian army offensive aimed at cutting off rebel supply lines into the city. Though it prevented the Syrian army from accomplishing this, the Levant Front was unable to overcome poor coordination and dissolved in April 2015. It still exists but not as a unified entity. An operations room called "Tahrir Halab" formed in February, but it seemingly disappeared in March as the battle for Handarat village began to turn in the favor of the Syrian army.
Part of the reason the rebel campaign in Aleppo has been stalled is due to the offensive in Idlib. First was the assault on Idlib city on 24 March that saw a number of rebel factions coalesce into the Jaysh al-Fatah operations room. The Jaysh al-Fatah operations room captured the provincial capital several days into the attack. Almost a month later, on 22 April, Jaysh al-Fatah, in coordination with rebel brigades (including FSA battalions) in Hama, launched the "Battle of Victory" campaign to take Jisr al-Shughur. This attack was composed of an attack on Jisr al-Shughur but also moves to capture supply lines coming from the south of the city and east of the city.
As it became clear in mid-March that the Syrian army had retaken Handarat village north of Aleppo, one rebel commander commented that “The announcement of the battle for Idlib had a big effect on the Handarat front [because] many battalions joined the battle for Idlib, leaving their fronts in Aleppo."
With Jisr al-Shughur captured and Syrian army positions around Ariah virtually encircled, the question becomes whether or not the focus will soon return to Aleppo city. There were rumors several weeks ago that an offensive at Aleppo city was coming, and the 26 April statement forming the Fatah Halab operations room is the clearest indication yet that rebel factions may try to replicate their Idlib success in Aleppo, perhaps even before capitalizing on Jisr al-Shughur's location as an entry into Latakia.
The Syrian army presence in Ariah (particularly north of it in al-Mastuma and northeast in Qarmeed camp) is strong (at the time of this writing, Qarmeed is still under Syrian army control though Jabhat al-Nusra has launched a fierce battle to take it), meaning that rebel factions there will spend the immediate future putting as much pressure there as possible. In other words, assuming that the next priority is Aleppo city, an attack there will likely take weeks or perhaps even a month or two to manifest. When it comes, there will be a number of targets. One is Handarat camp, but others along the perimeter include al-Breij, Ramouseh, Khan Tuman, and Zahraa (district). Inside the city, a push will be made to take the citadel and surrounding districts to the west.
The element of surprise aided the offensive at Jisr al-Shughur in particular, for even though the Syrian army knew a major operation was coming, it predicted that the main target was Ariah. But what made the attack a real success was the coordination between the militias involved. Free Syrian Army factions -- many of whom have received US TOW anti-tank systems -- were strung out along supply lines, hitting Syrian army tanks and BMPs with missiles. The most powerful factions (Islamists like Ahrar al-Sham and Jabhat al-Nusra, among others) were among the direct assault on Jisr al-Shughur.
Despite being spread out across the Ghab Plain and southern Idlib, the rebel factions were able to devastate Syrian army positions in virtual unison, which is the type of close coordination that has largely been lacking on the rebel side in the war. Given the indications that a rebel offensive is coming to Aleppo city, the Syrian army is likely concerned about the possibility that its hold in Aleppo city is becoming increasingly precarious.